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The species, though insignificant in number, determine the existence of many other species in a given ecosystem. Such species is known as

Keystone species
Sacred species
Endemic species
Extinct species
Additional Questions

Acacia arabica is

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The ecological pyramid which can be inverted in a tree eco-system is

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Consider the following statements concerning food chains:
(a) Removal of 80% tigers from an area resulted in greatly increased growth of vegetation
(b) Removal of most of the carnivores resulted in an increased population of deer
(c) The length of food chains is generally limited to 3 - 4 trophic levels due to energy loss.
(d) The length of food chains may vary from 2 to 8 trophic levels.Which two of the above statements are correct?

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The remains of the dead plants and animals is called

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DDT residues are rapidly passed through food chain causing biomagnification because DDT is

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The most recently discovered ecosystem is

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The age of pyramid with broad base indicates

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The more abundant animals in a desert grassland are

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Assertion: In a food chain members of successive higher levels are fewer in number.

Reason: Number of organisms at any trophic level depends upon the availability of organisms which serve as food at the lower level.

The correct answer is:

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Assertion: Tropical rain forests are disappearing fast from developing countries such as India.

Reason: No value is attached to these forests because these are poor in biodiversity.

The correct answer is:

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